/*
 * Copyright (c) 2017, cxy7.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.b3log.solo.util;

import java.util.Arrays;

/**
 * Array utilities.
 *
 * @author <a href="http://cxy7.com">XyCai</a>
 * @version 1.0.0.0, Jun 20, 2013
 */
public final class ArrayUtils {

	/**
	 * Concatenates the specified arrays.
	 * 
	 * @param <T>
	 *            the type of array element
	 * @param first
	 *            the specified first array
	 * @param rest
	 *            the specified rest arrays
	 * @return concatenated array
	 */
	public static <T> T[] concatenate(final T[] first, final T[]... rest) {
		int totalLength = first.length;

		for (final T[] array : rest) {
			totalLength += array.length;
		}

		final T[] ret = Arrays.copyOf(first, totalLength);
		int offset = first.length;

		for (final T[] array : rest) {
			System.arraycopy(array, 0, ret, offset, array.length);
			offset += array.length;
		}

		return ret;
	}

	/**
	 * Private constructor.
	 */
	private ArrayUtils() {
	}
}
